Nikon 1541 Manuale Utente

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A
The 
B Buttons
For the purpose of focusing the camera, pressing 
either of the B buttons has the same effect as 
pressing the shutter-release button halfway 
(note that the B button for vertical shooting 
can only be used when the vertical shooting 
shutter-release button lock is unlocked; 0 42). In 
viewfinder photography, focus will remain 
locked after the B button is released, 
although the in-focus indicator (I) will not be 
displayed. Focus can be unlocked by pressing 
the B button again.
A
Predictive Focus Tracking
In AF-C mode, the camera will initiate predictive 
focus tracking if the subject moves toward or away from the camera 
while the shutter-release button is pressed halfway or either of the B 
buttons is pressed.
 
This allows the camera to track focus while 
attempting to predict where the subject will be when the shutter is 
released.
B button
B button for
vertical shooting